TMS320F280049: SPI interrupt not triggering after migrating code from an adapted example to my main project

Iván Pérez

Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

I adapted one TI example to work with SPI and DMA with an EEPROM. Everything worked fine but then I introduced the code to the main project and it does not work. When I debug step by step and I activate some register bits which my code is supposed to work, the ISR gets triggered.

I've managed to create minimal examples of both codes:

I've created a minimal example that reproduces the problem: https://drive.proton.me/urls/GBKNS0ND5C#r8Htr91tPpMs. Symptoms to watch out for:
1. Only two bytes sent. It should either read an array of bytes after the first two bytes or - if no eeprom connected - keep reading status register undefinitely, constantly reading a byte.
2. spiFinished stays at 0 after the first bytes are sent.
3. RX isr counters don't get incremented.
Here's the original project which did work: https://drive.proton.me/urls/DEE57V03MC#lktOnD1HAOWD. If there is no EEPROM it will keep querying the status register and if there is then it will read it to a buffer.

Example one was created exporting with 'in CCS, go to you project and right click and "Export" Then pick "file System" and also check "resolve and export linked resources"' but somehow some headers are missing. I think it has something to do with the project being created using Simulink (C2000 Support Package). I've tried copying by hand. It should contain everything (except maybe C2000Ware files). You also got a .out precompiled. Let me know if you can work with this:

https://drive.proton.me/urls/N81Y8SBK5G#lrPlB1bNKvEQ

1 month ago

0 Delaney Woodward 1 month ago

TI__Mastermind 21140 points

Hi Ivan,

I will look into this and get back to you.

Best Regards,

Delaney

0 Delaney Woodward 1 month ago in reply to Delaney Woodward

TI__Mastermind 21140 points

Hi Ivan,

It sounds like your interrupt setup is good if a register write can trigger the ISR. Is the C2000ware example you're referring to spi_ex6_eeprom? If not, can you refer me to the example you got working and the path in C2000ware?

Is the hardware setup being used on the main project the same one you used to test the standalone example? for example, the same LaunchPAD in both cases, same GPIO configurations etc.?

What does the main project do (which peripherals are used, what is the timing of the system, etc.)?

Best Regards,

Delaney

0 Iván Pérez 1 month ago in reply to Delaney Woodward

Prodigy 70 points

Hello Delaney,

What I sent you were two minimal projects one that works and one that doesn't without any other parts of the main project that could distract us. I think it's best if we focus on them for the moment. Have you had the chance to try them out? I think all the necessary info is inside them. Otherwise, don't hesitate to ask.

Thanks,
Iván

0 Delaney Woodward 1 month ago in reply to Iván Pérez

TI__Mastermind 21140 points

Hi Ivan,

I usually try to rule out issues conceptually before trying out a project-level testing since it tends to pinpoint the issue faster. Although we can't generally offer full project debug support via E2E, I'm happy to help however I can. Please let me know if you could provide the answers to my above questions.

Best Regards,

Delaney

0 Iván Pérez 1 month ago in reply to Delaney Woodward

Prodigy 70 points

Is the hardware setup being used on the main project the same one you used to test the standalone example? for example, the same LaunchPAD in both cases, same GPIO configurations etc.?

Yes

What does the main project do (which peripherals are used, what is the timing of the system, etc.)?

I've got a minimal NOK example (see above) which reproduces the issue without any distractions that would be on the main project.
The minimal NOK example I provided should be the same with regards to SPI and is the same as far as I can see. One difference is that I am generating the project using matlab simulink and there is a rate monotonic scheduler. I included some dummy code just to get some viable example apart from my SPI code. The dummy code does some calculations in the CLA.

0 Iván Pérez 1 month ago in reply to Iván Pérez

Prodigy 70 points

Hi, any news on this issue?

Thanks

0 Aishwarya Rajesh 1 month ago

TI__Genius 17695 points

Hi Ivan,

The expert is currently out of office and will get back to you as soon as they return this week. Please expect a delay in response, thank you.

Best Regards,

Aishwarya

0 Delaney Woodward 24 days ago in reply to Aishwarya Rajesh

TI__Mastermind 21140 points

Hi Ivan,

Apologies for the delay.

Iván Pérez said:
I began with "spi_ex7_eeprom_dma" but I changed a lot of things to make it suit my needs.

Can you provide all the changes made to the original example? Usually, it is helpful to implement changes to working code one at a time, and test in between each change, that way it is easier to know which change caused the issue.

If the Matlab generation is causing the issue, support for that would have to come from Matlab directly - contact. Please also take a look at MathWorks FAQ at this link below:

Best Regards,

Delaney

0 Iván Pérez 24 days ago in reply to Delaney Woodward

Prodigy 70 points

The changes I made to the original example are working. Only after using that code in another project it is not working and can't figure out why. Have you taken a look at the code? Any doubts about how it works? Perhaps if you execute it step by step you'll see the problem I can't see.

I wasn't raising a complaint about code generation, just trying to give you clues. In any case, whether the code is generated automatically or by myself and whether I start from an official example or by scratch, it should work based on the reference manual, but it doesn't and that is why I am asking for help.

0 Delaney Woodward 18 days ago in reply to Iván Pérez

TI__Mastermind 21140 points

Hi Ivan,

Unfortunately, I still haven't had time to review the code you sent. If you could provide a conceptual explanation of the changes made from the example or any specific questions you have, I can help with that.

Best Regards,

Delaney

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TMS320F280049: SPI interrupt not triggering after migrating code from an adapted example to my main project